Variable-inductance unit for radiocircuits



Nov. 30,1926. 1,608,740

' O. F. HESLAR I VARIABLE INDUCTANCE UNIT FOR RADIOCIRCUITS $.Sheets-Sheet 1 Filed June 30, 1922 INVENTOR.

OLfl E #554172.

Nov. 30, 1926.

O. F. HESLAR VARIABLE INDUCTANCE UNIT FOR RADIOCIRCUITS 3 Sheets-Sheet 2 Filed June 30, 1922 ATTORNEYS- Nov. 30 1926. 1,608,740

0. F. HE SLAR VARIABLE INDUCTANCE UNiT FOR RADICCIRCUITS Filed June so, 1922 3 SheetsSheet :5

INVENTOR.

04/7 IVE-$117k.

earear one F. HESLAR, or mnmnArcmsc-nzrnnin, ASSIG-NQR ro innirllvn anure-s ren ING a ELECTRIC 00., or MARION, INDIANA, A CORPORATION or Iranians.

VARIABLE-INDUCTANCE UNIT non nnnrocra'onrrsy Application filed June 30, 1922. SeriaI No. 571.998.

This invention relates to a combination vario-coupler and variometer combined in a single unit for facilitating and increasing the range of adjustments in tuning an instrument to any particular wave length.

It is the main object of this invention to not only combine these two elements into one unit, but to so combine them that the coupling between the variometer and the vario-coupler will be the indurtance of either one or both rotors or movable elements, or any combination brought about by their relative position. This permits of a very fine adjustment andenables the operatorto tune the instrument to a more defined and definite wave length. By placing the coils in opposition, theinductance thereof will be one-half of the total normal inductance when the windings are conc dent, or less, depend ing upon the relative position of the rotary members. This combination unit greatly 1ncreases the co-efiicient of coupling, at the same. time allowing the maximum variation in the closed oscillating or antenna circuit without the disturbance of the coupling coefiicient.

The full nature of the invention will be understood from the accompanying drawings and the following description and claims.

In the drawings, Fig. 1 is a plan view of the unit with the rotary members turned therein, and a portion thereof broken away. Fig. 2 is a section taken on the line 2-2 of Fig. 1 withthe rotary members in alignment with the secondary member. Fig. 8 is a section taken on the line 3- -8 of Fig. 2. Fi i is a plan view of the actuating knob. Fig.

5 is a diagrammatic illustration showing the unit connected in a receiving circuit. Fig. 6 is the same as Fig. 5 showing a modified form of connection in a receiving circuit.

In the drawings there is shown a stationary element or stator mounted upon the bracket supports 10 and having a shell 11 of a substantially spherical shape provided with suitable openings on each side thereof, as shown in Fig. 1. Said shell is formed of the usual non-conducting material, such as composition rubber or the like, and is formed in two halves secured together by the bolts 12. The inner surface of said shell is wound in the usual manner with a wire coil 13 di vided in two sections or halves, one extendopposite openings, as above described.

and the outer ends of said coils constitute the terminals15 and 16 which are coni'lected with the secondary or closed oscillating circuit, as shown in Fig. 6. This stationary member orstator comprises one coil of the vario-coupler. The other member or coil of the vario-coupler consists of the two movable members or rotors, as will be hereinafter described. p

The shell 11 is provided with suitable bearings diametrically opposed, andas shown in Fig; 1. 'Mounted within said shell and conforming to the curvature thereof, there is a rotary member 17 comprising a substantially spherical shell having openings on opposite sides thereof to conform with the similaropenings in the shell 11. Mounted on opposite sides of the shell 17 and extending through the bearings. in the shell 11, there are tubular shafts 18 adapted'to rotatabl shell 17 are so arranged that when in one position, they will be concentric with the windings 13 positioned on the inner surface of the shell 11. The inner ends of the windings 19 areconnected to each other at 2O and the outer ends thereof are electrically connect-ed to the opposite tubular shafts 18, one connection being. at 21, and the other at 22. V

Similarly mounted in the rotor shell 17, there is a second rotor shell 23 mounted, concentri'callytherein, and" of the same spherical. shape provided with the diametrica ly Said shell 23 is mounted upon the tubular shaft 24 and the solid shaft 25, extending diametrically opposite thereto, through the tubular shafts 18 so as to turn therein. This arrangement permits the rotor shells 17 and 23 to be revolved or turned independently of each other within the stator shell 11. The shell 23 is provided with a winding or coil 26 formed in two separate sections about the outer surface thereof, as above described, coincident with the windings 19. The inner ends of the sections of the winding 26 are connected at 27. The outer end of one of the sections is arranged to extend through the tubular post at and be insulated therefrom, terminating in the wire 28. The opposite end of the other section of the winding 26 is connected with the shaft 24: by the wire 29 at its connection With the shell 23 in the interior thereof. The shafts 2a and 25 are insulated from the shafts 18 by an insulating sleeve 30. For connecting the Winding or coil 19 with the coil 26 so as to connect the rotors and thereby form a variometer, the shaft 2 1 is connected with the shaft 18 by the connection 31. This connection passes from the coil 26 through the Wire 29, shaft 2st to the shaft 18 and through the connection 21 to the coil 19.

It Will be obvious that the two rotors arranged as above described and connected together form in themselves a variometer, and the two rotors as a unit form one manber of a vario-coupler, the stator member being the other element. The two elements of the vario-coupler being co-incident and the distance between them being at no time varied, there will be no disturbance of the coupling coefiicient.

The unit may be mounted in any suitable casing, of which there is shown herein a portion of the front panel32 for supporting said unit. The shaft 18 is adapted to extend through said panel and be keyed to the knob or indicator 33 which is suitably insulated therefrom and positioned on the outer face of said panel. Mounted on the indicator 33, there is a smaller knob or indicator 34 which is likewise secured to the end of the shaft 25 and insulated therefrom, whereby the operator may adjust the rotary position of either of the rotors independently of each other. The knob 33 is provided with a suitable slot 35 extending in a. semicircle about its center into which extends a pin 36 mounted upon the inner face of the lHlOb 34. The knob 33 is so arranged that it may only be turned about an angle of 180 degrees, through Which movement theknob is carried with it by engagement of the pin 36 in the slot 35. However, after the knob 33 has been turned 180 degrees and can be turned no further, the knob 34 may still be turned an additional 180 degrees, or

360 degrees in all, by the pin-36 passing from one end of the slot 35 to the other. It will be obvious, therefore, that whereas heretofore there has only been one rotor adjustment, there is provided herein two rotor adjustments, which permits of a great many differential variations to be made for obtaining a more complete adjustment.

Figs. 5 andfi diametrically illustrate the manner of connecting the unit in the circuit. Fig. 5 shows the rotors 19 and 26 connected in the antenna circuit, wherein there is an antenna A and a ground G. The stator 13 is connected in tl e closed oscillating circuit, wherein there is a variable condenser VC, telephones T, plate battery P-L, battery B and vacuum tube V -T. In Fig. 6 the connection is reversed, wherein the stator i3 is connected in the antenna circuit; while the rotors 19 and 26 comprising the variometer are connected into the closed oscillating circuit. It will be obvious that various other arrangements and connections may be equally well employed as those shown herein for illustrative purposes The invention claimed is:

1. A variable inductance unit for a radio circuit comprising a stator coil, two rotor coils, said coils being concentrically arranged, concentric shafts fixed to the rotor coils, a knob on the shaft of one of the rotor coils provided with an arcuate groove having terminal stop shoulders, and a knob on the shaft of the other rotor coil provided with a projection slidably engaging said groove and adapted for-cooperation with said stop shoulders.

2. A variable inductance unit for a radio circuit com rising a stator coil, two rotor coils, said coils being concentrically ar ranged, concentric shafts fixed to the rotor coils, and adjusting knobs upon said shafts having juxtaposed faces, the face of one knob being provided with an a 'cuate groove having terminal stop shoulders and the face of the other knob being provided with a pin slidably engaging said groove and adapted for coaction with said shoulders.

In witness whereof, I have hereunto atfixed my signature.

OLA F. HESLAR. 

